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y "1 �3 „a SECTION 3 SITE INVESTIGATION J i 1. ;r SOM BORING AND SOIL SAMPLING PROCEDURES ` Three (3) soil borings were installed using 10-inch hollow-stem augers. Boring locations were described in Section 2 and are shown in Figure 4. Soil borings were designated as SB-01, SB-02, and SB-03, which correspond to monitoring wells MW-1, -;. MW-2 and MW-3, respectively. The total depth of each boring was 25 feet below ' ' ground surface (bgs). Total depth was selected based on encountering a groundwater at r approximately 15 feet bgs in each well, which allowed construction of monitoring wells with 10 feet of screened interval below and 5 feet of screened interval above the water x table. ` During soil-boring operations, soil samples were collected at least every five feet in ifi the unsaturated zone with a split-spoon sampler. Representative portions of the soil samples were split for head space OVA screening, iithologic description, and laboratory e analysis. Soil sa!males were collected in brass tubes within the split-spoon sampler. The ends of each tube were covr�ed with Teflon tape and then capped with plastic caps. The caps were sealed will: duct tape, at the recommendation of the Public Health Services r representative. During soil-boring operations, geological descriptions of the soil were made by an on- site geologist, and soil-baring logs were constructed. These soil-boring Iogs (with s monitoring well consuruction data)are displayed in Appendix B. The most contaminated soil sample above the water table from each boring was submitted for laboratory analysis. 1`hP most contaminated sample was determined by field OVA analysis. For each sampling point, soil was preserved in glass jars filled approximately 1/2 full, and the jar —nouth covered with aluminum foil and then capped. 3-1 a' 175-0/15 4/24193